Ditto is the easiest way to find out if someone is interested in you, or wants to talk to you again. Search for the person youre interested in, and hit like on their profile. If they havent liked you yet, they will have no idea that you liked them. However, if you both hit like on each other, Ditto will match the two of you, and give you the opportunity to message with them. Your match will only last for twelve hours, so make sure to message them quickly!